<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <!--指数运算-->
    <script>
        let a=2;
        var b=a**=2;
        console.log("b--"+b);
        let c=2;
        var d=c**=3;
        console.log("d--"+d);
    </script>
</body>
</html>